Session replay streaming is not one file format. Browser automation providers generally expose either a structured DOM/event replay (which reconstructs page state and interactions) or a rendered-frame recording (which plays back pixels from the browser viewport). Live viewing is a separate capability from streaming a completed recording. Choose the representation and delivery method that match your QA, support, or operations workflow, then design masking, retention, and authorization before capturing real user data.
What session replay streaming means
A browser automation session produces more than a final screenshot. It changes the DOM, moves the pointer, types, scrolls, navigates, emits console messages, and requests network resources. A replay system captures some of that activity and delivers an inspectable result to a developer or operator.
- Live viewing: watch or interact with a run while it is still executing.
- Completed replay: inspect a recording after the run has ended, often inside a QA or support product.
- DOM/event replay: store structured changes and events, then reconstruct the page in a player.
- Rendered-frame recording: store images of the browser viewport and encode them as video segments.
Do not assume that a product called “session replay” records a video. Browserless documents an RRWeb-based DOM/event system, while Browserbase describes a rendered-frame pipeline. Their fidelity, file size, integration work, and failure modes differ.
What is the difference between session replay and screen recording?
| Aspect | DOM/event replay | Rendered-frame recording |
|---|---|---|
| Representation | DOM mutations, input and browser events reconstructed by a player | Timestamped images of what the viewport displayed, encoded as video |
| Strength | Inspect interactions and structured events; useful for debugging selectors and state | Faithfully shows visual output, including pixels that are difficult to reconstruct |
| Known limits | Cross-origin iframes, very high DOM activity, WebGL and canvas can be incomplete or imperfect | Shows pixels but not necessarily the underlying DOM, accessibility tree, or event semantics |
| Typical delivery | Provider dashboard or an uploaded replay artifact | Video file or HLS playlist for a player |
Browserless says its Session Replay uses RRWeb and captures DOM mutations, mouse movement, clicks, scrolling, keyboard input, console output, and network requests (official documentation). Browserbase describes capturing Chrome DevTools Protocol screencast frames as PNG images, then encoding HLS fMP4 segments with H.264 (engineering article). Neither description guarantees identical results on every site.
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How can I watch a Playwright session live?
Use a provider’s live-view handoff when an engineer needs to intervene during execution. Browserless documents LiveURL as a separate interactive capability from its recordings (Session Replay). A typical flow is:
- Start the browser session with the provider’s live-view option enabled.
- Pass the returned LiveURL to an authenticated internal dashboard, not to an untrusted user.
- Display the URL in a tightly controlled iframe or open it for an operator.
- Keep automation logs and a run identifier alongside the live view so the operator can correlate actions.
- When the run finishes, save the provider’s replay identifier or recording URL for post-run review.
A live view is not a durable audit record. Capture a completed replay as well if your workflow needs evidence after the browser closes. Treat the LiveURL as a credential: enforce short expiry, authorization, and redaction in your own application.
How do I replay a browser automation run with Browserless?
Browserless documents replay=true for its RRWeb-based Session Replay. Recording starts when the browser connection is made. A CDP session can send Browserless.stopSessionRecording to stop and upload the data; closing the browser also saves the recording. Session Replay requires a paid Browserless plan, according to its documentation.
The exact WebSocket endpoint and authentication format depend on your Browserless account. Set BROWSERLESS_WS to the endpoint shown in your account documentation, preserving the replay=true parameter:
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import { chromium } from 'playwright';
const browser = await chromium.connectOverCDP(process.env.BROWSERLESS_WS);
const context = browser.contexts()[0] ?? await browser.newContext();
const page = await context.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.getByRole('link').first().click().catch(() => {});
// Keep the run deterministic and close it cleanly so the provider can save replay data.
await browser.close();For an explicit stop, create a CDP session and call the documented command before closing:
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const cdp = await context.newCDPSession(page);
// Browserless-specific command; use it only on a Browserless session.
await cdp.send('Browserless.stopSessionRecording');
await browser.close();Browserless says input values are masked while an interactive LiveURL viewer is connected, and that values entered by Browserless from a stored credential remain masked later in replay for that browser session. Confirm the current behavior and scope in your account before relying on it for compliance.
How do I record a browser screen instead?
Browserless separates DOM Session Replay from Screen Recording. Its screen-recording documentation describes WebM capture, while its CDP reference says server-side recording requires record=true and CDP start/stop commands (CDP Extensions).
const cdp = await context.newCDPSession(page);
await cdp.send('Browserless.startRecording');
await page.goto('https://example.com', { waitUntil: 'networkidle' });
const result = await cdp.send('Browserless.stopRecording');
console.log(result); // recording metadata supplied by Browserless
Use the command names and response fields from the current Browserless reference for your account. Browserless states that server-side recording is refused after a credential has been filled on the session because the recording could capture the secret. Plan authentication accordingly: either record before secret entry or use a DOM replay with documented masking.
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Browserbase’s Session Replay API lists tabs in a session and returns an HLS playlist for a selected recorded tab. That makes it possible to put playback in a QA tool, support dashboard, or internal review surface instead of forcing users into a provider console (API announcement). The observability product page also describes live view, replay, structured logs, network traces, and console output (Observability).
Integrate it as a backend-mediated flow:
- Authenticate your server to Browserbase and identify the completed session.
- Call the Session Replay API to list recorded tabs.
- Request the HLS playlist for the tab the user selected.
- Return a short-lived, authorized playback URL to your frontend.
- Use an HLS-capable player and keep the playlist URL out of public logs.
Do not hard-code an endpoint or response shape from an example copied elsewhere; use the current Browserbase API reference associated with your account. Browserbase’s May 14, 2026 announcement says recordings are stored for 31 days. That is a dated vendor statement, not a universal retention rule, so verify the current terms before promising customers a retention period.
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Multiple tabs, timing, and fidelity
Browserbase’s engineering description treats each tab as its own stream on a shared global timeline and says the design supports up to ten simultaneous tabs. It also describes eager encoding of roughly the first 30 seconds followed by just-in-time encoding, and reports that about 8% of sessions are replayed. Those are Browserbase figures about its own system, not independent benchmarks.
Ask these questions before selecting a provider:
- Are pop-up tabs and navigations captured, and can viewers switch tabs?
- Does playback preserve a common clock across tabs?
- What happens when a page uses a cross-origin iframe, canvas, WebGL, video, or a rapidly mutating DOM?
- Is the artifact available while the run is active, only after completion, or both?
- Can your backend obtain a playlist or file, or is review dashboard-only?
Privacy, secrets, and access control
Replay data can contain credentials, personal information, tokens in URLs, support conversations, and sensitive page content. Build a data-handling policy before enabling capture.
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- Masking: identify which input types and provider-generated credentials are masked, and test failure paths.
- Capture boundaries: disable recording around payment, password, and token entry when masking is insufficient.
- Authorization: proxy playback through your backend, require user authentication, and issue short-lived links or tokens.
- Retention: define deletion schedules; do not infer your provider’s retention from another vendor.
- Logs: scrub replay URLs, HLS playlists, cookies, and authorization headers from application logs.
- Tenant isolation: ensure a support agent can open only sessions belonging to the correct customer or workspace.
Browserbase describes short-lived signed tokens for segment URLs in its engineering article. Browserless documents masking behavior and a refusal to record after stored credentials are filled. These safeguards are vendor-specific and should not be generalized to every replay service.
Embedding replays in a QA dashboard
Store a run record containing the test name, commit, environment, browser version, session identifier, start and end times, failure message, and replay reference. Render status and logs first, then load the replay only when a reviewer requests it. This avoids transferring large media for every list view and lets you enforce authorization before playback.
For HLS, use a player that supports the browsers you target and provide a fallback message when a playlist has expired. For DOM replay, serve the provider’s player or artifact in an isolated origin if possible. Keep event logs and screenshots linked to the same run identifier so a reviewer can jump from a failed assertion to the relevant moment.
Performance, cost, and reliability considerations
- DOM/event files grow with DOM churn; long sessions with high activity can become expensive to store and slow to load.
- Rendered-frame encoding consumes bandwidth and storage; asynchronous encoding can introduce a delay before playback is ready.
- Capture only the viewport or tabs needed for diagnosis, and set explicit maximum run durations.
- Retry metadata fetches, not browser actions, unless the action is known to be idempotent.
- Record provider and browser errors separately from application failures so a missing replay does not hide the original test result.
- Validate replay availability in a post-run job and alert when an expected artifact is missing.
Troubleshooting common failures
There is no replay after the browser closes
Confirm the session was started with the provider’s replay option, that the browser closed cleanly, and that your plan permits replay. For Browserless, use replay=true and stop with the documented CDP command when you need an explicit upload.
The replay is blank or missing an iframe
Check whether the page uses a cross-origin iframe, canvas, WebGL, or a navigation that created another tab. DOM replay may not reproduce those surfaces; use rendered-frame recording when visual evidence is the priority.
Playback exposes a secret
Stop capture before entering the secret, use provider masking, and remove the artifact. Never rely on a player UI mask as your only control; restrict access and retention as well.
HLS playback fails in the browser
Check that the playlist has not expired, that segment URLs are authorized, and that your player supports HLS in the target browser. Keep the playlist behind your backend rather than embedding a permanent public URL.
The live view works but completed replay does not
Live viewing and completed recording are separate features. Enable the recording mode explicitly and verify that the provider uploaded or encoded the artifact after the run.
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If your immediate need is a clean image of a page or state—not an interactive session replay—ScreenshotNeo provides a one-request screenshot API. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, with the result identified by X-Page-Verdict and X-Billed headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. It is not a replacement for a time-based DOM or video replay, but it is useful for deterministic evidence images.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport requests
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Choosing an implementation
| Requirement | Best fit to investigate | Reason |
|---|---|---|
| Inspect DOM changes and user events | Browserless Session Replay | RRWeb-based event and DOM capture |
| Embed completed playback in your product | Browserbase Session Replay API | Tab listing and HLS playlist delivery |
| Show exactly what pixels appeared | Rendered-frame or Browserless WebM recording | Visual evidence rather than reconstructed state |
| Watch an active run | Provider live-view feature | Live handoff is distinct from completed replay |
Evaluate the actual page types, tab behavior, privacy controls, retention, plan requirements, and API authorization in a small representative pilot. Vendor documentation explains implementation, but no independent benchmark establishes one approach as universally superior.
FAQ
Is session replay the same as a screenshot?
No. A screenshot is one instant; replay contains a sequence of events or frames and can show how the page reached that state.
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Can I replay a run after the provider’s retention window?
Only if you exported or copied the artifact to storage you control before it expired. Retention differs by provider and plan.
Should I capture every browser tab?
Capture only tabs needed for diagnosis unless your workflow explicitly requires cross-tab evidence; more tabs increase data volume and privacy exposure.
Frequently Asked Questions
Is session replay the same as a screenshot?
No. A screenshot is one instant; replay contains a sequence of events or frames and can show how the page reached that state.
Can I replay a run after the provider’s retention window?
Only if you exported or copied the artifact to storage you control before it expired. Retention differs by provider and plan.
Should I capture every browser tab?
Capture only tabs needed for diagnosis unless your workflow explicitly requires cross-tab evidence; more tabs increase data volume and privacy exposure.
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